Amdek

Amdek effects (may have been manufactured) by
Boss and (may have been) supplied in kit-form for assembly. Information below is interesting but I can't vouch for its authenticity.

"AMDEK (Analogue Music Digital Electronics Kits): Although
Roland was based in Hamamatsu by the early 80s, Kakehashi established
the AMDEK Corporation in Osaka. Their main product lines were small
effects units and computer monitors manufactured for Roland (but not by
Roland) in Taiwan."

"For a couple of years, the company proved to be
surprisingly successful but, as competition mounted, Kakehashi decided
not to compete with the large computer companies entering the market,
and in 1983 he ceased supplying monitors, simultaneously discontinuing
the effects units."

"But this was not the end for the company. Kakehashi
renamed it the 'Roland DG Corporation', and then used it as a vehicle to
release a range of the company's own computer and music peripherals."